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Although not officially
available (or supported by DNNA) for the Riot, it happens to function
with the Riot as well as newer players. Potentially later updates
to RMM might break support with the older players.

I think the reason is is because the song is in the wrong format where did you get the song from was it the same place you usually get songs from and did you change the format by accident this could be the only problem that you're having